Self-consistent solution of cosmological radiation-hydrodynamics and chemical ionization
نویسندگان
چکیده
منابع مشابه
Self-consistent solution of cosmological radiation-hydrodynamics and chemical ionization
We consider a PDE system comprising compressible hydrodynamics, flux-limited diffusion radiation transport and chemical ionization kinetics in a cosmologicallyexpanding universe. Under an operator-split framework, the cosmological hydrodynamics equations are solved through the Piecewise Parabolic Method, as implemented in the Enzo community hydrodynamics code. The remainder of the model, compri...
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We describe an extension of the cosmological hydrodynamics code Enzo to include the self-consistent transport of ionizing radiation modeled in the flux-limited diffusion approximation. A novel feature of our algorithm is a coupled implicit solution of radiation transport, ionization kinetics, and gas photoheating, making the timestepping for this portion of the calculation resolution independen...
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We have developed a method of solving for multi-species chemical reaction flows in non–equilibrium and self–consistently with the hydrodynamic equations in an expanding FLRW universe. The method is based on a backward differencing scheme for the required stability when solving stiff sets of equations and is designed to be efficient for three-dimensional calculations without sacrificing accuracy...
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The particle emission in relativistic hydrodynamic model is formulated assuming a sharp 3-dimensional space-time freeze-out hypersurface. The boundary conditions correspond to the energy-momentum and charge conservation between fluid and the gas of free particles . The emission and possible feedback of particles are included into the self-consistent hydrodynamic scheme. For the time-like parts ...
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Here I discuss some implicit assumptions of modern hydrodynamic models and argue that their accuracy cannot be better than 10-15 %. Then I formulate the correct conservation laws for the fluid emitting particles from an the arbitrary freeze-out (FO) hypersurface (HS) and show that the derived momentum distribution function of emitted particles does not contain negative contributions which appea...
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ژورنال
عنوان ژورنال: Journal of Computational Physics
سال: 2009
ISSN: 0021-9991
DOI: 10.1016/j.jcp.2009.06.006